Barracuda Networks

Clustering
The Barracuda Spam & Virus Firewall supports clustering of multiple nodes for both redundancy and to increase total system capacity. For centralized management, Barracuda Spam Firewalls share configuration and policy across the cluster, and administrators can change policy or access any message received across the cluster from any individual node. For redundancy of quarantine mail storage, all quarantined messages are stored in at least two nodes in the cluster, ensuring that messages are always available in the event that one node becomes unavailable. Barracuda Spam & Virus Firewall clusters can span geographies to facilitate redundancy across sites.

Barracuda Spam & Virus Firewall clusters are typically deployed in conjunction with balancing of DNS MX records or with an IP load balancer, such as the Barracuda Load Balancer. In general, configuring multiple MX records is a preferred deployment when setting up Barracuda Spam Firewalls across multiple locations. Because of the potential for spammers to attack each IP address listed in the DNS MX record, many Barracuda Spam & Virus Firewall customers who place multiple systems in a single location prefer using an IP load balancer to hide multiple Barracuda Spam & Virus Firewalls behind a single virtual IP address.